He wrote a series of books ("Paradis" "Resurrection" "Warhawk" "Second Coming" etc.) that were sort of an expanded version of what we saw in the trailer.
I consider those books sort of the 'closure' that TOS BSG never had (and I'm happy to report that they ignore G1980 completely; save for adult Boxey calling himself Troy).

Too bad Hatch never got to write one where the ol' G actually makes it to Earth...